loading dumpfile make with svndumpfilter --drop-empty-revs option

currently I'm moving a svnpath template server to a svnparentpath model.
Each repositories are dump through a svnadmin dump -r
revision_start:revision_end| svndumpfilter include "my_repository"
--delete-emtpy-revs > my_repository.dumpfile
Each dumpfile are loaded through a svnadmin load my_new_repository_folder
< my_repository.dumpfile command
But sometimes, when I load a dump with some historical file copies, I have
a problem or loading with relative revision missing.
For exemple, If in the older repository, I have a file calledl
class_copy.php from class.php at the revision 5000, it's seems that my
dump keep log from the revision difference between the file and copy. but
with delete-empty-revs props, I can't match this revision in the dump.
Is there a way to fix this problem? I can't keep all revisions (without
--delete-empty-revs) in my new repository.
Best regards

Matthieu

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